Weblogic 12c and Managed Server in incompatible state

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issue
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All of the servers selected are currently in a state which is incompatible with this operation or are not associated
with a running Node Manager or you are not authorized to perform the action requested. No action will be performed.


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Solution :
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The solution is to delete the “managed_server.state” file under your domain in “servers/managed_server/data/nodemanager/” where managed_server is your managed server’s name..So, stop everything, delete/move  managed_server.state from your managed server folder and start everything (go to console to start your managed sever as it is SHUTDOWN).


[oracle@linux6 nodemanager]$ ls -ltr
total 16
-rw-r-----. 1 oracle dba 174 Dec 31 22:48 boot.properties
-rw-r-----. 1 oracle dba 423 Dec 31 22:48 startup.properties
-rw-r-----. 1 oracle dba  27 Dec 31 23:03 WLS_SOA1.url
-rw-r-----. 1 oracle dba  24 Dec 31 23:25 WLS_SOA1.state
[oracle@linux6 nodemanager]$ mv WLS_SOA1.state WLS_SOA1.state_backup
[oracle@linux6 nodemanager]$ pwd
/u01/app/oracle/product/12.1.3/fmw/user_projects/domains/soa_domain/servers/WLS_SOA1/data/nodemanager
[oracle@linux6 nodemanager]$

Now start the Managed server and your issue will get resolved ..